Piston for force-pumps



(No Model.)

S. P. SPOONER.

PIsToN FOR Forum PUMPS. N0. 307,815.

Patented Nov. 11, 1884.

NITED STATES PATENT OEEICE.

SAMUEL P. SPOONER, OF BUCKLIN, MISSOURI.

PISTON AFOR FORCE-PUMPS.

SPECIFICATION forming part `of Letters Patent No. 307,815, dated November 11, 1884.

Application filed October 19, 1883.

(No model.)

To all whom, it may concern: I

Be it known that I, SAMUEL P. SrooNEE, a citizen of the United States, residing at Bucklin, in the county'of Linn and State of Missouri,have invented certain new and useful Improvements in Double-Acting Force-Pumps; and I do hereby declare that the following` is a full, clear, and exact description of the same, reference being made to the accompanying drawings, forming a part of this speciiioation, and in which- Figure l represents a longitudinal vertical central section through my improved pump; Fig. 2, adetail view ofthe double piston-head. Fig. 3 is a detail View to be referred to.

This invention rela-tes to certain new and useful improvements inthe class of double-acting force-pumps; and it consists in novel features of construction and combination andarrangement of parts, all as will be hereinafter fully described, and set forth in the claims hereto annexed.

In the drawings, A represents the cylinder of a pump, provided at its ends with the cir-A cular valve-chambers B B, centrally divided by a partition, b, to which are connected or v hinged the valves b b2.

C C represent, respectively, the induction and eduction pipes.

D represents the piston-rod passing centrally through the valve-chambers and cylinder, and having mounted centrally thereon the piston-head E, composed of a disk or ring centrally divided,so as to form a double pistonhead, by a partition, c, and each side of said disk or ring strengthened by radiating ribs c. rlhis disk or ring is provided with outside annular iianges, e2, and central outside flange, c3, the circumference of said ring having perforations c" through it between said central and l outer flanges, which are covered by rubber packing-ringsff, and these rings encircled by eXpansibl'e metallic cut rings gg, all as clearly shown in Figs. l and 3. The 'perforations e* through the disk or ring are for the purpose of allowing the compressed air or water to keep the packing-rings pressed out against the inner surface of the cylinder, and thereby form a tight packing between piston-head and cylinder. On each side of the piston-head is arranged a circular rubber flange, E', substantially as shown in Figs. 1 and 3, for the purpose of sweeping the inner surface of the cylinder, and thereby keeping it free from grit or gritty substances, and thereby permitting the piston-head to work much more freely and easier in the cylinder. The rubber flanges E should be provided with metal rings so inserted as to preventthe rubber from wearing away too fast.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. The combination, with the cylinder, of

the piston-head provided with the rubber..

sweeping iiange or flanges E', substantially as and for the purpose herein shown and described.

2. Theherein-desciibed doublepistou-head, composed of the disk or ring centrally divided by partition c, annular proj ecting flanges el c2, central annular iiange, e3, and having perforations e through it between said llanges e2 and c3, packing-rings f f, and expansible cut metallic rings g g, substantially as and for the purpose herein shown and described.

SAMUEL l?. SPOON ER.

Witnesses:

THoMAs V. BRYANT, DANIEL B. HoLMEs. 

